William holzee



(No Model.)

W. HOLZER.

METHOD OF MANUFACTURING INGANDESOENT ELEGTBIO LAMPS.

Patented July 28, 1886.

' UNITED STATES PATEaT Fries.

\VILLIAM' HOLZER, OF HARRISON, NEXVJERSEY.

METHOD OF MANUFACTURING INCANDESCENT ELECTRIC LAMPS.

SPECIFICATION-forming part of Letters Patent No. 323,150, dated July 28,1885.

Application filed June 5, 1884.

To all whom it may concern:

Be it known that I, WILLIAM HOLZER, of Harrison, in the county of Hudsonand State of New Jersey, have invented a certain new and usefulImprovement in the Method of Manufacturing Incandescing Electric Lamps,of which the following is a specification.

The flexible carbon conductors or loops of incandescing electric lampsfrequently become bent and irregular in shape during the process ofcarbonization, and sometimes, when raised to high incandescence, duringthe operation of exhausting the globes. This difficulty increases as theloops are increased in length and decreased in cross-sectional area, andforms a serious obstacle in the way of making highresistance loops ofregular and uniform shape. The object I have in view is to overcome thisdifficulty, which I do by subjecting the loops to strain while raised toincandescence in a vacuum. This ldo while the lamps are being exhausted.A weight is attached to the end of eachloop and keeps it under constantstrain. \Vhen the loop is raised to a high incandescence, as it is atthe end of the process of exhaustion, the carbon becomes somewhatplastic and the weight draws the loop into regular shape or prevents itfrom assuming an irregular form. This weight may be a wire with a hookend, and, if not heavy enough itself, may have any suitable bodyattached to it to increase-its weight. The wire is passed into theexhaust-tube of the lamp and hooked onto the loop hanging down into suchexhaust-- tube. The exhaust-tube is made of sufficient length, so thatwhen the lamp is ready for sealing off from the pump a seal can be madein the tube which will leave a tube attached to the lamp as long as theweight. By manipulation the weight is then unhooked from the loop anddrops into the tube, when the lamp is sealed offfrom the tube carryingthe weight. The weight can then be removed from the tube and used withother lamps.

The weight may be just sufficient to straighten the loop or prevent itfrom bending without materially changing its form, or it may be heavyenough to change the shape of the loop by drawing it into a wedge form.

This process may be appliedto lamps in the course of construction, orlamps already con- (No model.)

structed and having irregular loops may be opened and have exhaust-tubesattached to them, and then be reexhausted and have their loopsstraightened by this process.

In the accompanying drawings, forming a part hereof, Figure l is anelevation of a lamp with exhaust-tube attached as it appears beforeexhaustion, the weight hanging on the loop; Fig. 2, an elevation of thelamp after the first sealing, the weight being detached from loop, andFig. 3 an elevation of the lamp after final sealing.

Like letters denote corresponding parts in all three figures.

A is a lamp-bulb sealed to stem at, and inclosing a carbon-loop, B,secured to leadingin wires 1 2, passing through and sealed into theglass, as usual. The bulb has attached to it an exhaust-tube, 0, intowhich is passed the wire-weight D with a hook end for hanging the weighton the loop, as shown in Fig. 1. A wire of copper or platinum has beenfound suitable. A piece of glass is shown as fused to the end of thewire to increase its weight. 7 5

The weight is hooked onto the loop by inserting a suitable tool in tube0, and the lamp I is then put on the pump in the position shown in Fig.l, the'weight hanging downwardly.

After the operation of exhaustion is completed, which includes theheating of the loop to high incandescence by an electric current, thetube 0 is sealed off at the point indicated by the dotted line b in Fig.1, producing the construction shown in Fig. 2. By manipulating the lampthe wire is unhooked from the loop and dropped into the closed tubeO,when this tube carrying the weight is sealed off from the lamp at thepoint e, and the lamp is given its final sealing, producing theconstruction shown in Fig. 3. The lamp is then provided withcircuitterminals in any suitable way, and is ready for use.

The design of the lamp bulb and carbon shown in Fig. 3 is covered by anapplication of even date herewith.

What I claim is-- 1. The method of straightening a loop-formincandescing conductor or of changing its shape, consisting insubjecting it to strain 100 while raised to incandescence, substantiallyas set forth. I

5 maintaining such conductor under constant strain during suchoperation, substantially as set forth.

3. The method of exhausting and sealing inoandescing electric lampshaving loop-form IO conductors, consisting in attaching weights to theloops, then exhausting such lamps and heating the conductors therein,then sealing off the tubes some distance from the lamps, then removingthe weights from the conductors and dropping them into said tubes, andfinally sealing off the lamps from the tubes above the Weights,substantially as set forth.

This specification signed and witnessed this 1st day of May, 1884.

WVILLIAM HOLZER.

Witnesses:

ALF. W. KIDDLE, E. O. ROWLAND.

